/*
 * Copyright (C) 2005 Luca Veltri - University of Parma - Italy
 * 
 * This file is part of MjSip (http://www.mjsip.org)
 * 
 * MjSip is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * MjSip is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with MjSip; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * Author(s):
 * Luca Veltri (luca.veltri@unipr.it)
 */

package org.mjsip.sip.header;



import java.util.Date;
//import java.text.DateFormat;
//import java.text.SimpleDateFormat;

import org.mjsip.sip.address.GenericURI;
import org.mjsip.sip.address.NameAddress;
import org.mjsip.sip.provider.SipParser;
import org.zoolu.util.DateFormat;
import org.zoolu.util.Parser;



/** SIP Header Contact.
  * The Contact header field provides a SIP or SIPS URI that can be used
  * to contact that specific instance of the UA for subsequent requests.
  * The Contact header field MUST be present and contain exactly one SIP
  * URI in any request that can result in the establishment of a
  * dialog (i.e. INVITEs).
  * <p> Note: for backward compatibility with legacy implementations
  * the date format in 'expires' parameter is still supported
  * although it has been deprecated in RFC 3261.
  */
public class ContactHeader extends EndPointHeader {
	
	/** Creates a ContactHeader with '*' as contact value */
	public ContactHeader() {
		super(new LegacyHeader(SipHeaders.Contact,null));
		value="*";
	}

	public ContactHeader(NameAddress nameaddr) {
		super(SipHeaders.Contact,nameaddr);
	}

	public ContactHeader(GenericURI uri) {
		super(SipHeaders.Contact,uri);
	}

	public ContactHeader(Header hd) {
		super(hd);
	}
	
	//public void setStar()
	//{  value="*";
	//}

	public ContactHeader setExpires(Date expire) {
		setParameter("expires","\""+DateFormat.formatEEEddMMMyyyyhhmmss(expire)+"\"");
		return this;
	}

	public ContactHeader setExpires(int secs) {
		setParameter("expires",Integer.toString(secs));
		return this;
	}

	public boolean isStar() {
		if (value.indexOf('*')>=0) return true;
		else return false;
	}
	
	public boolean hasExpires() {
		return hasParameter("expires");
	}

	public boolean isExpired() {
		if (getExpires()==0) return true;
		else return false;
	}

	public int getExpires() {
		int secs=-1;
		String exp_param=getParameter("expires");
		if (exp_param!=null) {
			if (exp_param.indexOf("GMT")>=0) {
				Date date=(new SipParser((new Parser(exp_param)).getStringUnquoted())).getDate();
				secs=(int)((date.getTime()-System.currentTimeMillis())/1000);
				if (secs<0) secs=0;
			}
			else secs=(new SipParser(exp_param)).getInt();
		}
		return secs;
	}

	public Date getExpiresDate() {
		Date date=null;
		String exp_param=getParameter("expires");
		if (exp_param!=null)  {
			if (exp_param.indexOf("GMT")>=0) {
				date=(new SipParser((new Parser(exp_param)).getStringUnquoted())).getDate();
			}
			else {
				long secs=(new SipParser(exp_param)).getInt();
				if (secs>=0) date=new Date(System.currentTimeMillis()+secs*1000);
			}
		}
		return date;
	}
	
	public ContactHeader removeExpires() {
		removeParameter("expires");
		return this;
	}
/*   
	public static String toString(Vector clist) {
		String str="Contact: "; 
		for (int i=0; i<clist.size(); i++) {
			ContactHeader ch=(ContactHeader)(clist.elementAt(i));
			str+=ch;
			if (i<(clist.size()-1)) str+=", ";
		}
		return str+"\r\n";   
	}   
*/
}
